Shelf organizer



FIG. 1 is a perspective view of a shelf organizer showing my new design, the shelf and additional shelf organizer being shown in broken lines for illustrative purposes only;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for a shelf organizer, as shown and described. 